NAME

       iswalpha - test for alphabetic wide character

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <wctype.h>

       int iswalpha(wint_t wc);

DESCRIPTION

       The  iswalpha()  function is the wide-character equivalent of the isalpha(3) function.  It
       tests whether wc is a wide character belonging to the wide-character class "alpha".

       The wide-character class "alpha" is a subclass of the wide-character  class  "alnum",  and
       therefore  also  a  subclass of the wide-character class "graph" and of the wide-character
       class "print".

       Being a subclass of the wide-character class "print", the wide-character class "alpha"  is
       disjoint from the wide-character class "cntrl".

       Being  a subclass of the wide-character class "graph", the wide-character class "alpha" is
       disjoint from the wide-character class "space" and its subclass "blank".

       Being a subclass of the wide-character class "alnum", the wide-character class "alpha"  is
       disjoint from the wide-character class "punct".

       The wide-character class "alpha" is disjoint from the wide-character class "digit".

       The wide-character class "alpha" contains the wide-character classes "upper" and "lower".

       The  wide-character  class "alpha" always contains at least the letters 'A' to 'Z' and 'a'
       to 'z'.

RETURN VALUE

       The iswalpha() function returns nonzero if wc is a wide character belonging to  the  wide-
       character class "alpha".  Otherwise, it returns zero.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       ┌────────────────────────────────────────────────────────┬───────────────┬────────────────┐
       │Interface                                               │ Attribute     │ Value          │
       ├────────────────────────────────────────────────────────┼───────────────┼────────────────┤
       │iswalpha()                                              │ Thread safety │ MT-Safe locale │
       └────────────────────────────────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       POSIX.1-2001, C99.

NOTES

       The behavior of iswalpha() depends on the LC_CTYPE category of the current locale.

SEE ALSO

       isalpha(3), iswctype(3)